Java日期处理工具类DateUtils详解

本文实例为大家分享了Java日期处理工具类DateUtils的具体代码，供大家参考，具体内容如下

import java.sql.Timestamp; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.Date; 
 
 
public class DateUtils { 
 
  
 public static final String PATTERN_YMD = "yyyy-MM-dd"; 
 
  
 public static final String PATTERN_YMDHMS="yyyy-MM-dd HH:mm:ss"; 
 
  
 public static String formatDate(Date date) { 
 return formatDate(date, PATTERN_YMD); 
 } 
 
  
 public static String formatDate(Date date, String pattern) { 
 if (date == null) 
  throw new IllegalArgumentException("date is null"); 
 if (pattern == null) 
  throw new IllegalArgumentException("pattern is null"); 
  
 SimpleDateFormat formatter = new SimpleDateFormat(pattern); 
 return formatter.format(date); 
 } 
 
  
 public static Date parseDate(String datevalue) { 
 return parseDate(datevalue, null); 
 } 
 
  
 public static Date parseDate(String datevalue, String dateFormat) { 
 if (datevalue == null) { 
  throw new IllegalArgumentException("datevalue is null"); 
 } 
 if (dateFormat == null) { 
  dateFormat = PATTERN_YMD; 
 } 
  
 SimpleDateFormat df = new SimpleDateFormat(dateFormat); 
 Date result = null; 
 try { 
  result = df.parse(datevalue); 
 } 
 catch (ParseException pe) { 
  pe.printStackTrace();// 日期型字符串格式错误 
 } 
 return result; 
 } 
 
  
 public static Date addYears(Date date, int amount) { 
 return add(date, Calendar.YEAR, amount); 
 } 
 
  
 public static Timestamp addYears(Timestamp timestamp, int amount) { 
 return add(timestamp, Calendar.YEAR, amount); 
 } 
 
 //----------------------------------------------------------------------- 
  
 public static Date addMonths(Date date, int amount) { 
 return add(date, Calendar.MONTH, amount); 
 } 
 
  
 public static Timestamp addMonths(Timestamp timestamp, int amount) { 
 return add(timestamp, Calendar.MONTH, amount); 
 } 
 
 //----------------------------------------------------------------------- 
  
 public static Date addDays(Date date, int amount) { 
 return add(date, Calendar.DATE, amount); 
 } 
 
  
 public static Timestamp addDays(Timestamp timestamp, int amount) { 
 return add(timestamp, Calendar.DATE, amount); 
 } 
 
 //----------------------------------------------------------------------- 
  
 public static Timestamp addMinutes(Timestamp timestamp, int amount) { 
 return add(timestamp, Calendar.MINUTE, amount); 
 } 
 
  
 public static Timestamp addDays(int amount) { 
 Calendar c = Calendar.getInstance(); 
 c.add(Calendar.DATE, amount); 
 return new Timestamp(c.getTimeInMillis()); 
 } 
 
 //----------------------------------------------------------------------- 
  
 private static Date add(Date date, int calendarField, int amount) { 
 if (date == null) { 
  throw new IllegalArgumentException("The date must not be null"); 
 } 
 Calendar c = Calendar.getInstance(); 
 c.setTime(date); 
 c.add(calendarField, amount); 
 return c.getTime(); 
 } 
 
  
 private static Timestamp add(Timestamp timestamp, int calendarField, int amount) { 
 if (timestamp == null) { 
  throw new IllegalArgumentException("The timestamp must not be null"); 
 } 
 Calendar c = Calendar.getInstance(); 
 c.setTime(timestamp); 
 c.add(calendarField, amount); 
 return new Timestamp(c.getTimeInMillis()); 
 } 
 
  
 public static Timestamp now() { 
 Calendar c = Calendar.getInstance(); 
 c.set(Calendar.HOUR_OF_DAY, 0); 
 c.set(Calendar.MINUTE, 0); 
 c.set(Calendar.SECOND, 0); 
 c.set(Calendar.MILLISECOND, 0); 
 return new Timestamp(c.getTimeInMillis()); 
 } 
 
 
 
  
 private DateUtils() { 
 } 
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。